Bad vibration at highway speeds
02-21-2008, 05:49 PM
#1
TECH Enthusiast
Thread Starter
iTrader: (47)
Join Date: Aug 2007
Location: BAY AREA CA
Posts: 711
Likes: 0
Received 0 Likes
on
0 Posts
Bad vibration at highway speeds the vibration happens at speeds above about 40mph, with the car in gear, and neutral. feels like its coming from directly underneath me. thought it was an unbalanced flywheel, but i just had a brand new spec billet flywheel installed, and the vibration is still there.
i do have a poly trans mount but its got over 2k on it already. balanced all the wheels/tires.
the car has full boltons, cam, 4.11s and minor suspension. not lowered and no torque arm.
this vibration is annoying the crap out of me!!
IDEAS!?
i do have a poly trans mount but its got over 2k on it already. balanced all the wheels/tires.
the car has full boltons, cam, 4.11s and minor suspension. not lowered and no torque arm.
this vibration is annoying the crap out of me!!
IDEAS!? 
02-21-2008, 05:52 PM
#2
LS1Tech Sponsor
Join Date: Feb 2006
Location: Rockfield Kentucky
Posts: 1,170
Likes: 0
Received 0 Likes
on
0 Posts
Several things, bad U joints, bent driveshaft, also look at the slip yoke in the trans. If the bushing is bad or the yoke has a grove from high miles that can cause a vibration.
I would say U Joints most likely.
Robin
I would say U Joints most likely.
Robin
02-21-2008, 05:55 PM
#3
Staging Lane
Join Date: Sep 2006
Location: Marion, Ohio
Posts: 65
Likes: 0
Received 0 Likes
on
0 Posts
the poly trans mount will always have that it did it on my old camaro and my newer z after it was put on....there is a way to get rid of it with that mount though not sure where i saw it though try to google it
02-21-2008, 10:13 PM
#5
TECH Resident
iTrader: (13)
Join Date: Jan 2003
Location: Montgomery, TX
Posts: 797
Likes: 0
Received 0 Likes
on
0 Posts
im pretty certain it has to be the driveshaft. the same exact thing happened to mine. i just got it fixed last week. my aluminum ds was bent. put a steel ds in and problem gone. it would vibrate from about 40 and up. i would feel it a lot through the rear view mirror, e brake handle, console, and a lil in the seats.
02-21-2008, 10:31 PM
#6
TECH Fanatic
Yeah, check the drive line and U joints. If you have a SAFE way to get under the car, check for play in the drive line by trying to move it with your hands. You want to be able to move the drive line with your hands in gear, and also in neutral, while looking at the amount of play. Usually the U joint before the rear end needs replacing. If you find one that is bad, replace both the front and rear.
02-22-2008, 12:18 AM
#7
TECH Enthusiast
Thread Starter
iTrader: (47)
Join Date: Aug 2007
Location: BAY AREA CA
Posts: 711
Likes: 0
Received 0 Likes
on
0 Posts
im pretty certain it has to be the driveshaft. the same exact thing happened to mine. i just got it fixed last week. my aluminum ds was bent. put a steel ds in and problem gone. it would vibrate from about 40 and up. i would feel it a lot through the rear view mirror, e brake handle, console, and a lil in the seats.
Trending Topics
02-22-2008, 12:34 AM
#8
TECH Resident
iTrader: (7)
Join Date: Feb 2008
Location: south point,OH
Posts: 755
Likes: 0
Received 0 Likes
on
0 Posts
the slip yoke is the front most part of the driveshaft that slides or slips into the trans, lift up and down, side to side at the front u-joint to see if any play where it goes into the trans, if its isolated to the u-joint then good, if it has alot of play inside the trans then the tailshaft bushing is bad that the yoke rides on. check the rear the same way, lift and shake, check the joint and also the yoke on the rear end as it has ears to hold the side to side movement of the joint that has the straps holding it.if any side to side here the pinion nut must be removed and replace the rear end yoke, if its just joints usually you will get a clank when you put it in gear and from drive to reverse, if no noise whatsoever then probably the yokes or shaft itself. the factory u-joints require heating to melt out the plastic that seals them in the shaft, if they have been replaced then very much easier and have clips that retain them in the shaft.
Thanks
02-22-2008, 05:30 PM
#10
For the love of god don't bend the rear crown on the drive shaft if you press out the stock u joints. Thats what I did to mine and it vibrated really badly forever after that. I just got a low miles used one and the vibes went away for the most part. Always get a little with poly mounts.
02-22-2008, 08:33 PM
#11
On The Tree
Join Date: Oct 2006
Location: sacramento,ca
Posts: 109
Likes: 0
Received 0 Likes
on
0 Posts
is there any power loss associated the bad u joint and slip yoke?? as far as putting power down on the street
Last edited by sportsaddict_21; 02-22-2008 at 10:47 PM.
02-23-2008, 03:17 PM
#15
TECH Enthusiast
Thread Starter
iTrader: (47)
Join Date: Aug 2007
Location: BAY AREA CA
Posts: 711
Likes: 0
Received 0 Likes
on
0 Posts
fuuuck. i guess driving is out for this weekend. back to the bmx til monday, hopefully nothing is damaged to bad already since its been doing this for about 2monthes
02-23-2008, 04:02 PM
#16
TECH Resident
iTrader: (13)
Join Date: Jan 2003
Location: Montgomery, TX
Posts: 797
Likes: 0
Received 0 Likes
on
0 Posts
ya man. i drove mine for about 2 months and i did trips from texas to arkansas, arkansas to oklahoma, oklahoma to texas, and texas back to oklahoma. but i would not sugguest doing that. first thing monday i would drop it off at a local drive train shop to check the balance and see if its straight. once you do that, let us know what they say.
02-23-2008, 07:39 PM
#17
TECH Resident
iTrader: (7)
Join Date: Feb 2008
Location: south point,OH
Posts: 755
Likes: 0
Received 0 Likes
on
0 Posts
ya man. i drove mine for about 2 months and i did trips from texas to arkansas, arkansas to oklahoma, oklahoma to texas, and texas back to oklahoma. but i would not sugguest doing that. first thing monday i would drop it off at a local drive train shop to check the balance and see if its straight. once you do that, let us know what they say.
